ERO and PIC simulations of gross and net erosion of tungsten in the outer strike-point region of ASDEX Upgrade

A. Hakola; M. I. Airila; N. Mellet; M. Groth; Juuso Karhunen; T. Kurki-Suonio; T. Makkonen; Heikki Sillanpää; G. Meisl; M. Oberkofler; ASDEX Upgrade Team

doi:10.1016/j.nme.2016.09.012

ERO and PIC simulations of gross and net erosion of tungsten in the outer strike-point region of ASDEX Upgrade

A. Hakola^*, M. I. Airila, N. Mellet, M. Groth, Juuso Karhunen, T. Kurki-Suonio, T. Makkonen, Heikki Sillanpää, G. Meisl, M. Oberkofler, ASDEX Upgrade Team

^*Corresponding author for this work

Department of Applied Physics

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Abstract

We have modelled net and gross erosion of W in low-density . l-mode plasmas in the low-field side strike point region of ASDEX Upgrade by ERO and Particle-in-Cell (PIC) simulations. The observed net-erosion peak at the strike point was mainly due to the light impurities present in the plasma while the noticeable net-deposition regions surrounding the erosion maximum could be attributed to the strong . E ×. B drift and the magnetic field bringing eroded particles from a distance of several meters towards the private flux region. Our results also imply that the role of cross-field diffusion is very small in the studied plasmas. The simulations indicate net/gross erosion ratio of 0.2-0.6, which is in line with the literature data and what was determined spectroscopically. The deviations from the estimates extracted from post-exposure ion-beam-analysis data (∼0.6-0.7) are most likely due to the measured re-deposition patterns showing the outcomes of multiple erosion-deposition cycles.

Original language	English
Pages (from-to)	423-428
Journal	Nuclear Materials and Energy
Volume	12
DOIs	https://doi.org/10.1016/j.nme.2016.09.012
Publication status	Published - Aug 2017
MoE publication type	A1 Journal article-refereed

Keywords

ASDEX Upgrade
Cross-field diffusion
ERO modelling
Particle drifts
PIC simulations
Tungsten erosion

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10.1016/j.nme.2016.09.012

1-s2.0-S2352179116300886-mainFinal published version, 1.52 MBLicence: CC BY-NC-ND

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title = "ERO and PIC simulations of gross and net erosion of tungsten in the outer strike-point region of ASDEX Upgrade",

abstract = "We have modelled net and gross erosion of W in low-density . l-mode plasmas in the low-field side strike point region of ASDEX Upgrade by ERO and Particle-in-Cell (PIC) simulations. The observed net-erosion peak at the strike point was mainly due to the light impurities present in the plasma while the noticeable net-deposition regions surrounding the erosion maximum could be attributed to the strong . E ×. B drift and the magnetic field bringing eroded particles from a distance of several meters towards the private flux region. Our results also imply that the role of cross-field diffusion is very small in the studied plasmas. The simulations indicate net/gross erosion ratio of 0.2-0.6, which is in line with the literature data and what was determined spectroscopically. The deviations from the estimates extracted from post-exposure ion-beam-analysis data (∼0.6-0.7) are most likely due to the measured re-deposition patterns showing the outcomes of multiple erosion-deposition cycles.",

keywords = "ASDEX Upgrade, Cross-field diffusion, ERO modelling, Particle drifts, PIC simulations, Tungsten erosion",

author = "A. Hakola and Airila, {M. I.} and N. Mellet and M. Groth and Juuso Karhunen and T. Kurki-Suonio and T. Makkonen and Heikki Sillanp{\"a}{\"a} and G. Meisl and M. Oberkofler and {ASDEX Upgrade Team}",

year = "2017",

month = aug,

doi = "10.1016/j.nme.2016.09.012",

language = "English",

volume = "12",

pages = "423--428",

journal = "Nuclear Materials and Energy",

issn = "2352-1791",

publisher = "Elsevier",

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TY - JOUR

T1 - ERO and PIC simulations of gross and net erosion of tungsten in the outer strike-point region of ASDEX Upgrade

AU - Hakola, A.

AU - Airila, M. I.

AU - Mellet, N.

AU - Groth, M.

AU - Karhunen, Juuso

AU - Kurki-Suonio, T.

AU - Makkonen, T.

AU - Sillanpää, Heikki

AU - Meisl, G.

AU - Oberkofler, M.

AU - ASDEX Upgrade Team

PY - 2017/8

Y1 - 2017/8

N2 - We have modelled net and gross erosion of W in low-density . l-mode plasmas in the low-field side strike point region of ASDEX Upgrade by ERO and Particle-in-Cell (PIC) simulations. The observed net-erosion peak at the strike point was mainly due to the light impurities present in the plasma while the noticeable net-deposition regions surrounding the erosion maximum could be attributed to the strong . E ×. B drift and the magnetic field bringing eroded particles from a distance of several meters towards the private flux region. Our results also imply that the role of cross-field diffusion is very small in the studied plasmas. The simulations indicate net/gross erosion ratio of 0.2-0.6, which is in line with the literature data and what was determined spectroscopically. The deviations from the estimates extracted from post-exposure ion-beam-analysis data (∼0.6-0.7) are most likely due to the measured re-deposition patterns showing the outcomes of multiple erosion-deposition cycles.

AB - We have modelled net and gross erosion of W in low-density . l-mode plasmas in the low-field side strike point region of ASDEX Upgrade by ERO and Particle-in-Cell (PIC) simulations. The observed net-erosion peak at the strike point was mainly due to the light impurities present in the plasma while the noticeable net-deposition regions surrounding the erosion maximum could be attributed to the strong . E ×. B drift and the magnetic field bringing eroded particles from a distance of several meters towards the private flux region. Our results also imply that the role of cross-field diffusion is very small in the studied plasmas. The simulations indicate net/gross erosion ratio of 0.2-0.6, which is in line with the literature data and what was determined spectroscopically. The deviations from the estimates extracted from post-exposure ion-beam-analysis data (∼0.6-0.7) are most likely due to the measured re-deposition patterns showing the outcomes of multiple erosion-deposition cycles.

KW - ASDEX Upgrade

KW - Cross-field diffusion

KW - ERO modelling

KW - Particle drifts

KW - PIC simulations

KW - Tungsten erosion

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U2 - 10.1016/j.nme.2016.09.012

DO - 10.1016/j.nme.2016.09.012

M3 - Article

SN - 2352-1791

VL - 12

SP - 423

EP - 428

JO - Nuclear Materials and Energy

JF - Nuclear Materials and Energy

ER -

ERO and PIC simulations of gross and net erosion of tungsten in the outer strike-point region of ASDEX Upgrade

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Keywords

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